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Feb. 19, 1929. 1,702,933

A. C. DANKS ET AL WATER TUBE BOILER Filed Dec 14, 1927 5 Sheets-Sheet l ll/l/ V//I//I/////////I/./////////////I/ Feb. 19, 1929.

A. C. DANKS ET AL WATER TUBE BOILER Filed Deo. 1 1927 5 Sheets-Sheet 1 J I 21:1 I if? E lNvENToRb wfi, a e/ 60 Patented Feb. 19, 1929.

TUNITEDSTATES PATENT OFFICE.

f ALFRED c. ba ms, on CLEVELAND, OHIO, AND KINGSLEY Ii. MARTIN, or MoN'rcnAm,

V NEW JERSEY.

WATER-TUBE BOILER.

Application filed December 14, 1927. Serial lie/239,932.

The invention relates to water tube boiler constructions, and particularly to baflle walls, as used in such boilers of a wide Variety of types, both horizontal and vertical, such as the Stirling, Connely, Heine, Babcock and lVilcoX, WValsh and others. invention has for its primary objects, the provisions of an improved baflle wall; which shall be. gas tight, and atthe same time shall permit the ready removal of any tube or tubes which may fail; (2) which is reinforced and supported between banks of tubes,'so that it willbe maintained in position, even if cracked; which will remain serviceable and efiioient under the expansion and contraction, incident to the extreme temperature conditions, to which it is subjected; i) and in general, which has all the advantages of the ordinary baflie wall built of plastic material, with the added ones.

of increased strength due to the metal reinforcing employed, and of greater facility in tube replacement, due to the molded refractory sectionswhich are used with the plastic material. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein Figure l is a vertical section through a vertical water tube boiler showing the location of baflie walls to which the invention is applicable. Fig. 2 is a detail section taken through the battle, where it crosses the tubes, on the line 11-11 of Fig. 1. F ig. is a section on the line III-III of Fig. 2 Fig. 4: is a detail section taken through the battle where it extends longitudinally of the tubes, as on the line IVIV of Fig. 1. Fig. 5 is a section on the line VV of Fig. 4:. Fig. 6 is a section through a modifiedform of baflle. And Fig. 7 is a section similar to that ofFig. 3 through another modification.

By way of. illustration, the baiiles are shown as applied to a Stirling boiler, but it will be understood that the invention is applicable to the other types of vertical boilers as well as to those of the horizontal types, and that the claims are applicable to all types, unless otherwise limited by their terms. The boiler shown, comprises the setting 1, the fire-box 2, the three banks of tubes 3, -land 5, the headers 6, 7, 8 and 9, the front battle comprising the sections 10 The sections 12 and 13, the sections 10 and 12 extending longitudinally of the tubes and the sections 11 and 13 extending transversely of the tubes. 7

Figs. 2 and 3 indicate the construction of the bafile where it extends transversely of the tubes 14, 15 and 16 of the bank 4, while Figs. 4 and 5 indicate its construction whereit extends longitudinally of the tubes 17, i8 and 19 of the bank 3. As shown in these figures, the alternate spaces A and B, are made wide and narrow, respectively, in accordance with the regular practice, the wide spaces being designed to give room for the removal of the tubes, when it becomes necessary to take them out for replacement or repair. r

The battle wall is composed in the main of plastic refractory material 20, well known in the art, which hardens into a strong solid body in a short time after fabrication. This material is reinforced in the narrow spaces 13 by-the metal rods 21, of square cross'section, although reinforcing of any other desired material or form may be employed. In the wide spaces A, the plastic 'inaterial is subdivided by strips of molded refractory material, such as the strips 22 of the wedge cross section shown in Figs. 2 and 3, and the strips 23 of the cross section shown in Figs. a and 5. These strips are of any convenient length for handling and installing, and may be of a variety of fire clay or other refractory compositions, which. are preformed or molded and hardened, or burned (depending on the composition) before being used. The cross section of these strips will vary, depending on conditions, the wedge section of Fig. 3 being preferably employed, where gravity tends to hold the strips in position, while that of Fig. 5, or one of the same order, is employed in more or less upright battles where the strips might become accidentally displaced. The main purpose of these strips is to provide for the removal of'the baffle material when it becomes necessary to take out a tube, although they are of value for another reason, as later set forth. At such time, the adjacent strip 22 or 23 may be easily knocked. out, after which it is not difiicult to break out the plastic material 20.

In the construction of Fig. 6, the reinforcing rods 24.- and. the molded refractory strips 25 alternate, as in the constructions of Figs; 2' and 5, but arearranged' diagdegree of strengthto the baffle as a whole,

so that in case of cracking,the bai'ile will maintain itself in position, this being particularly important in the spaces between tube banks where. the wall is otherwise unsupported bythe tubes. This additional support is also secured without making the baffle too difiicult of removal, in part, or in whole, in order to replace tubes; since the use of the molded refractory strips permit alleys to be opened up without diihculty in .the wide spaces, it being much easier to knock out, these strips, and then the plastic material remaining,.than it is to break out a solid wall of plastic material. Thereis also less cracking in a well including the moldedstrips than in a solid wall of plastic material, as the composite wall can give at thejoints under contraction and expansion strains induced by severe temperature conditions. As a result, the baffle will not permit the gas leakage past it after a period of service, such as occurs withthe ordinary baffle of plastic material. Other advantages and variations in form n which the invention maybe embodied will be readily apparent to those skilledin the art; 7

. lVhat we claim is:' I

1 In combination in awater tube boiler,

a battle wall of originally. plastic material hardened in position subdivided atintervals between the tubes'by molded refractory ma terial readily removable.

2. In combination in a water tube boiler, a baffle wall of originally plastic material hardened in position subdivided at intervals between the tubes by molded refractory material readily removable and reinforced at intervals in the spaces other than those in which the molded refractory is located.

3. In combination in a Water tube boiler havin alternate wide and narrow soaces between the tubes, a battle wall of originally plastic-materialhardened in position, subdivided in the wide spaces between the tubes by strips of molded refractory material readily" removable.

4. In combination in a water tube boiler having alternate wide and narrow spaces between the tubes, a baflle Wall of originally plastic material hardened in position provided in the narrow spaces between the tubes with metal reinforcing and subdivided in the wide spaces between the tubes by strips ofmolded refractory material readily removable.

5/111 combination in a water tube boiler, a baiflewall of originally plastic material hardened in position subdivided at intervals between the tubes by strips of molded refractory material readily removable, but

shaped so as to normally maintain themselves in position.

6. In combination in a water tube boiler, a balfle wall of originally plastic material hardened in posit-ion subdivided at intervals between the tubes by strips of molded refractory material wedge shaped in cross section and readily removable.

7. In combination in a Water tube boiler having alternate wide and narrow spaces between the tubes, a baffle wall of originally plastic material hardened in position, subdivided .in the wide spaces between the tubes y strips of molded refractory material of wedge shape in cross section.

8. In combination in a water tube boiler having alternate wide and narrow spaces between the tubes, a baflle wall of originally plastic material hardened in position, provided in the narrow spaces between the tubes with metal reinforcing and subdivided in the wide spaces between the tubes by strips of molded refractory material readily removable, but interfitting with the plastic material, so to prevent accidental displacement.

9. In combination in a vertical water tube boiler having the tubes arranged with alternate wide and narrow spaces, baffle wall extending longitudinally of a bank of tubes for a portion of the length thereof and transversely of one of the banks of tubes, the baffle being composed of originally plasticv material hardened in position, reinforced in the narrow spaces between the tubes,

and subdivided in the wide spaces by strips of molded removable.

In testimony whereof, we have hereunto subscribed our names.

ALFRED C. DANKS. KINGSLEY L. MARTIN.

refractory material readily 

